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以35 mm厚臭冷杉气干光边板为试验材料,采用2种厚度压缩率,分别在160、180℃的热压温度下进行表面压密化处理;然后将表面压密材在温度分别为180、200℃的热湿环境下进行高温热处理,对表面压密化对比材与高温热处理材试件进行常温浸水处理;分析了表面压缩率、热压温度、热处理条件等因子对臭冷杉表面压密地板材厚度方向变形恢复的影响。结果表明:在实验所采用的开放热压工艺下,臭冷杉弦切板材的实际压密区位于上、下表面2 mm处,达到了表面压密强化的目的;表面压密试件在温度为200℃时经高温热处理1 h,其厚度方向变形恢复率为对比材的28.6%;高温热处理工艺是改善表面压密材尺寸稳定性的有效方法。
With 35 mm thick stout fir dry light as the test material, two kinds of thickness compression rates were used to densify the surface at hot pressing temperature of 160 and 180 ℃, respectively. Then, 180,200 ℃ hot and humid environment for high temperature heat treatment, the surface of the compacted material and high temperature heat-treated specimens at room temperature immersion treatment; analysis of the surface compression rate, hot pressing temperature, heat treatment conditions and other factors on the fir surface pressure The influence of deformation recovery in the thickness direction of the dense plate. The results show that under the condition of open hot pressing, the actual compacting area of the cut firwood cut string is located at 2 mm above and below the surface, achieving the purpose of surface compaction strengthening; At 200 ℃, the high temperature heat treatment for 1 h, the thickness of the deformation recovery rate of 28.6% of the contrast material; high temperature heat treatment process is to improve the dimensional stability of the surface of the compact material effective method.